CN102082596A - Communication method and device based on dual-channel technology - Google Patents
Communication method and device based on dual-channel technology Download PDFInfo
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- CN102082596A CN102082596A CN2009102501780A CN200910250178A CN102082596A CN 102082596 A CN102082596 A CN 102082596A CN 2009102501780 A CN2009102501780 A CN 2009102501780A CN 200910250178 A CN200910250178 A CN 200910250178A CN 102082596 A CN102082596 A CN 102082596A
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Abstract
The embodiment of the invention discloses a communication method and device based on a dual-channel technology, which promotes the application capability of the existing TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) network, improves the covering capacity of the system, enhances the covering accuracy and depth and lowers the construction difficulty of the TD-SCDMA system by using dual-polarized dual-channel antennae. The invention solves the problem of the poor covering capacity of the TD (Time Division) network in universities, residential areas and other areas, and achieves more flexible system construction capability and higher applicability, thereby better conforming to the construction direction of the TD system. Besides, under the condition of identical covering capacity, the number of the location points of antennae can be decreased to half, the antenna concealment can be better, the coordination difficulty of adjoining dwellers can be lowered, and the construction and coordination investment can be reduced, thereby bringing remarkable economic benefits.
Description
Technical field
The embodiment of the invention relates to communication technical field, particularly a kind of method and apparatus that communicates based on the binary channels technology.
Background technology
TD-SCDMA (Time Division-Synchronous Code Division MultipleAccess, the CDMA (Code Division Multiple Access) that the time-division is synchronous) system mainly contains single channel technology and two kinds of radio frequency design schemes of eight passage technologies at present.
Wherein, eight passage technologies adopt multichannel smart antenna, are aided with multichannel Remote Radio Unit (Radio Remote Unit, RRU) and multichannel excipient algorithm, its advantage is that the excipient gain is high, user selection is strong, and joint-detection is effective, and internal system is disturbed inhibition degree height.
But its shortcoming is that antenna size is big, property is coordinated and engineering construction difficulty height, is applicable to the macro base station coverage mode usually.
The single channel technology adopts common antenna, and no excipient ability can't be used joint-detection, and it is little to gain, and internal interference is big.Therefore intelligence is applicable to that indoor distributed system covers usually.
In the process that realizes the embodiment of the invention, the inventor finds that there is following problem at least in prior art:
Because TD-SCDMA system frequency height, penetration capacity are poor, a little less than the more original 2G of the coverage effect system.And according to himself characteristic, the main initiation of TD characteristic service is present in indoor usually, as residential quarter, colleges and universities etc.
These are regional because the site coverage height is decayed seriously, and common grand station planning thinking is difficult to prove effective, and need carry out outdoor compartment system construction and carry out accurate degree of depth covering.
And existing TD radio-frequency technique is difficult to above zone or construction mode are supported, and uses eight channel units, because antenna size is bigger, must cause large-scale resident's dispute; Adopt single channel then can the reduction system to increase and be and interference rejection capability, cause system capability to descend, influence user's perception.
Summary of the invention
The embodiment of the invention provides a kind of method and apparatus that communicates based on the binary channels technology, makes the pattern that advertisement is chargeed according to the service conditions of paying by mails, and the Search Results of location service is according to the service conditions ordering of paying by mails.
For achieving the above object, the embodiment of the invention provides a kind of method that communicates based on the binary channels technology on the one hand, it is characterized in that, specifically may further comprise the steps:
The binary channels antenna carries out gain process according to binary channels figuration and adjustment algorithm to signal;
The binary channels of described binary channels antenna by quadrature sends the described signal of communication that carries out after the gain process.
Preferably, the binary channels of described binary channels antenna has ± 45 ° polarization orthogonal.
Preferably, described binary channels antenna between space interval more than or equal to 10cm.
On the other hand, the embodiment of the invention also provides a kind of binary channels antenna, specifically comprises:
Gain module is used for according to binary channels figuration and adjustment algorithm signal being carried out gain process;
Communication module is connected with described gain module, is used for binary channels by quadrature and sends signal of communication after described gain module carries out gain process.
Preferably, the binary channels of described binary channels antenna has ± 45 ° polarization orthogonal.
Preferably, described binary channels antenna between space interval more than or equal to 10cm.
Compared with prior art, the embodiment of the invention has the following advantages:
By using the technical scheme that the embodiment of the invention proposed, realize that by advertisement the back is to charge, the associating electronics is realized the feedback model of advertisement, reduce the end user and use professional threshold, offering chance of promoting product of businessman, is from the trial of mobile value-added service to the transformation of mobile Internet business, passes through electronic fare payment system, realize that ad system charges by the actual certificate that uses, realize that the searching order of LBS business is considered this factor of customer consumption situation.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The schematic flow sheet of Fig. 1 a kind of method that communicates based on the binary channels technology for the embodiment of the invention proposed;
Fig. 2 is the structural representation of a kind of dual polarization binary channels antenna of embodiment of the invention proposition.
Embodiment
In order to address the above problem, the present invention proposes binary channels technology based on the TD-SCDMA system, design the dual polarization binary channels and made up antenna, and the excipient algorithm and the fast dispatch algorithm that match of technology therewith.
Under these technical conditions, dual polarization binary channels antenna size is reduced to about 30% of single polarization binary channels antenna, and is only big by 15% than the single channel antenna, the construction disguise and the convenience in the zone that utilizes more that the crowd is dense.Simultaneously, adopted dual channel system after, than original single channel system, system descending gain increases 3dB, the system uplink gain promotes 1.7dB, coverage can expand and is twice.
Under same covering requires, it only be original 50% that the antenna point position demand of TD-SCDMA system reduces, and has reduced network rebuilding construction difficulty, reducings the construction costs, reduce the possibility of user's dispute, promoted the corporate social image of TD-SCDMA system capability and company.
In order to realize technical scheme of the present invention, the embodiment of the invention has proposed a kind of method that communicates based on the binary channels technology, and its schematic flow sheet specifically may further comprise the steps as shown in Figure 1:
Step S101, binary channels antenna carry out gain process according to binary channels figuration and adjustment algorithm to signal;
Step S102, the binary channels antenna binary channels by quadrature sends the described signal of communication that carries out after the gain process.
It is to be noted; the particular content of above-mentioned said binary channels technology and respective algorithms can be adjusted according to concrete application scenarios; can reach under the prerequisite of identical technique effect; can realize that the technical scheme that the binary channels dual polarized antenna is disposed can belong to protection scope of the present invention; and the particular content of corresponding binary channels algorithm also can change as required; the algorithm arrangement that the corresponding binary channels dual polarized antenna of every coupling is disposed all belongs to protection scope of the present invention.
Compared with prior art, the technical scheme that the embodiment of the invention proposed promotes existing TD-SCMDA network application ability, improves the covering power of system, the accuracy and the degree of depth that reinforcement covers.By the application of new technique, the system uplink gain promotes 3dB, and descending gain promotes 1.3-1.7dB, and the edge throughput promotes more than 70%.
Reduce the TD-SCDMA system and build difficulty.Binary channels dual polarized antenna size and approaching with the single-polarized antenna size of gain only is 1/16 of 8 passage antennas.In carrying out the outdoor compartment system construction in sub-district, the difficulty of coordinating, building reduces greatly, has promoted the public image and the social responsibility of company.
Solved the difficult problem of the covering power deficiency in TD network zone such as in colleges and universities, residential block, system's constructive ability is more flexible, and adaptability is stronger, the Construction Party who fits in the TD system more to.
Under the same covering power, half can be reduced in the antenna point position, and the antenna disguise is higher, can alleviate peripheral resident's coordination difficulty, reduces to build and coordinates to drop into, and brings distinct economic.
Existing TD binary channels technology is for initiating in the industry, the creationary binary channels technology of utilizing is carried out the construction of outdoor cell compartment system, covering power, the reduction internal interference of system have effectively been promoted, the reduction system builds difficulty, solved at the high density construction area, TD as zones such as residential quarter, colleges and universities covers a difficult problem, and the elevator system ability is reducingd the construction costs.
This system has improved the technical merit of domestic association area research greatly, helps whole nation colleague to improve the level in this field.
In wireless network used in everyday, tend to run into wireless router, wireless aps, the situation that signal cover is wide inadequately, penetration power is strong inadequately.Change a wireless device that signal is stronger, increased cost so undoubtedly greatly, can wireless device realize that remote signal stabilization transmits in fact, except outside the Pass the design with agreement, wireless module, equipment itself has, antenna serves as important role equally, the antenna of wireless device can reach the purpose that strengthens wireless signal, can be interpreted as it the amplifier of wireless signal.
At present many wireless routers and wlan card antenna all are to adopt detachable design, and promote the simplest direct method of wireless network signal strength is exactly to change the more antenna of high power gain.
Antenna has two parameters very crucial: antenna gain and directivity.Directivity refers to aerial radiation and receives whether sensing is arranged, and promptly whether sensitive especially the and emittance of the antenna signal of whether certain angle being come concentrates on certain angle.Antenna can be divided into omnidirectional antenna and directional antenna according to the difference of horizontal plane directivity.The advantage of directional antenna is gain can be done very high, and the sharp-pointed more antenna gain of general directivity is just high more, and the transmission range of signal is just far away more.Omnidirectional antenna installs more convenient, does not need to consider the problem of two ends antenna setting angle degree, and the characteristics of omnidirectional antenna are that area coverage is wide, load power is big, set up conveniently, polarization mode (horizontal polarization or perpendicular polarization) can be selected flexibly.
Gain expression antenna power multiplication factor, the multiplication factor of the big more expression signal of numerical value is just big more, that is to say when gain values big more, signal is strong more, transmission quality is just good more.The wireless route of selling in the existing market all is the antenna that carries 2dbi or 3dbi mostly, and the user can change the antenna of 4dbi, 5dbi or even 9dbi by different demands.
According to aerial radiation direction difference, can be divided into directional antenna and omnidirectional antenna.According to the The Research of Antenna Polarization difference, can be divided into single polarization, dual polarization etc.According to the antenna shapes difference, can be divided into conventional antenna and embellished antenna.According to the antenna type difference, can be divided into common antenna and particular antenna.
So-called dipole antenna is made of with all identical lead of length two thicknesses exactly, and the centre is two feed ends.
Modal 3 kinds of antennal interfaces are TNC interface, RP-SMA interface, N-K interface, and classical Linksys WRT54G adopts the TNC antennal interface exactly, and the wireless router of most of detachable antenna, wireless network card all are to adopt the RP-SMA interface.
The N-K interface then can be realized interface conversion, utilizes the conversion line N-K interface conversion can be become the RP-SMA interface, so just can link ceiling mount antenna on wireless router or the wireless network card.
In a kind of antenna structure of reality, lower floor is a L type probe feed microstrip antenna, and the upper strata is a T type probe feed microstrip antenna.Wherein, lower floor's paster is used for realizing the covering of GSM frequency range (820MHz～960MHz, centre frequency is 900MHz), and the upper strata paster is used for realizing the covering of 3G frequency range (1710MHz～2170MHz, centre frequency is 1940MHz).
Two kinds of independent element antennas are being carried out on the basis of emulation the size of the dual-band and dual-polarization element antenna of design integration:
Base plate 200mm * 200mm, the paster 120mm * 120mm of lower floor, upper strata paster 62mm * 62mm, lower floor's paster is 32mm apart from the distance of base plate, the distance of upper strata paster and lower floor's paster is 26mm.
The horizontal brachium 26mm of L type probe, horizontal arm is 30mm apart from the distance of base plate, probe is 40mm apart from the distance of center of antenna.
T type probe vertical length is 20mm, and the diameter of probe tip capacitance sheet is 12mm, and probe is apart from center of antenna 36mm.
For improving gain, need the dual-band and dual-polarization element antenna of designing is above organized battle array.During the group battle array, the selection of array element distance should be considered the requirement to beamwidth, and will take into account due suitable spacing between radiation element and feeder line, to avoid producing possible coupling and graing lobe.
Carry out simulation analysis by aerial array, find that the directional diagram of antenna array is functional when array element distance is between 0.5 λ～0.85 λ different array element distance.For this dual-band and dual-polarization element antenna, the GSM part is following, and centre frequency is decided to be 900MHz, wavelength X 1=333mm; The 3G part is last, and centre frequency is decided to be 1940MHz, wavelength X 2=155mm.
When element antenna group battle array with each limit from the horizontal by positive and negative 45 ° of placements, so for the GSM frequency range, even when the element antenna spacing is got minimum value 0.5 λ 1, for the element antenna of 3G frequency range, its spacing is also greater than 0.85 λ 2.Find by emulation, two bigger graing lobes can occur in the directional diagram of antenna at this moment.
So must improve to array structure, the one-segment element antenna that promptly between two dual-band unit antennas, adds a 3G, like this for GSM frequency range and 3G frequency range, all satisfied the condition of array element distance at 0.5 λ～0.85 λ, increase simultaneously the array number of 3G frequency range again, thereby improve the gain of antenna in the 3G frequency range.
The major technique innovation aspect of the technical program is to have designed special-purpose dual polarization binary channels TD dedicated antenna and developed binary channels excipient algorithm, fast dispatch algorithm and the RRU equipment etc. that are applicable to dual channel system.
Purpose and direction are applicability, flexibility and overburden depth and the covering accuracies for the more effective lifting of energy TD system.
In the technical solution of the present invention, TD-SCDMA protocol specification, intelligent antenna technology deeply excavated and many-side such as field engineering technical application combines, optimization lift technique at multichannel, smart antenna, excipient and the dispatching algorithm of TD-SCDMA system has been proposed, realize the application of dual channel system and relevant excipient algorithm, dispatching algorithm and binary channels, dual polarized antenna, still belong to initiative in industry.
Binary channels TD-SCMDA network technology is based on existing network TD-SCDMA system group network technology, on the basis of existing TD-SCDMA access network, based on existing multichannel of TD and single channel technology, the experience and the technical capability of building in conjunction with existing network have designed applicable to the dual polarization binary channels antenna under the shelter condition and binary channels excipient algorithm and fast dispatch algorithm.
In the application scenarios of reality, can adopt the dual polarized antenna panel antenna array to realize concrete allocating antenna, this antenna array is made up of two groups of antennas, every group of antenna has N antenna element (N is a positive integer), wherein all antenna a period of time common relatively vertical polarized antenna unit of each antenna element changes+45 ° on one group of antenna, and all antenna a period of time common relatively vertical polarized antenna unit of each unit changes-45 ° on another group antenna, and promptly these two groups of antennas are orthogonal polarizations.
The horizontal range of two adjacent antenna units equates in each group antenna, and this distance is between half wavelength to a wavelength that transmits.
When receiving, in conjunction with the algorithm of diversity technique and smart antenna, this antenna array can improve receiving sensitivity.
During emission, utilize the algorithm of smart antenna can realize the omni-beam excipient, this antenna array can improve the transmission performance of signal under multi-path environment in the synchronous code division multiple access communication system.
But in order to reach outstanding technique effect, the technical scheme that the embodiment of the invention proposed specifically defines and has realized a kind of small and exquisite 9dBi flexibly and two kinds of dual polarization binary channels of 12dBi plate antenna, and the whole of employing are twin-channel system and twin-channel antenna, all adopt the binary channels technology to carry out networking and covering.
From the antenna distance test result as can be seen, in wireless network card and wireless router close together, antenna gain is also not obvious to the influence of signal, in the time of apart from 1 meter, 2dbi antenna and 9dbi antenna are received on the wireless router, record signal strength signal intensity and only differ 5%, the antenna that increases high-gain far away when distance begins to embody its performance, and the antenna of low gain is along with the also constantly aggravation of increase signal intensity attenuation speed of distance.
In test result, can see a tangible phenomenon in addition, it is better than receiving on the wireless router exactly the antenna of high-gain to be received on the wireless network card effect, but when the antenna gain is not high, two antennas are for example arranged at hand, 1 antenna gain is that 2dbi, 1 antenna gain are 5dbi, the antenna of higher gain is received on the wireless router like this, be that the 5dbi antenna is received wireless router, the 2dbi antenna is received the effect of wireless network card and is received on the wireless router than 2dbi antenna, and the 5dbi antenna is received the effect of wireless network card and will be got well.
From The performance test results through walls as can be seen, antenna gain is high more, and performance through walls is good more, and 2dbi antenna and 9dbi antenna signal strength signal intensity after wearing 1 water blockoff mud wall nearly differs 20%.The same with distance test, if antenna gain is not high, then should receive the antenna of relative higher gain on the wireless router, the antenna lower antenna gain is connected on wireless network card, as the 5dbi antenna is received wireless router, the 2dbi antenna is received wireless network card, pass 1 wall after, signal strength signal intensity is received wireless router than 2dbi antenna, and it is strong by 10% that the 5dbi antenna is received wireless network card.When router and wireless network card two ends all were high-gain aerial, antenna changed commentaries on classics to performance impact through walls and little, and this point is then different with distance test.
In concrete application scenarios, the antenna of the technical scheme that the embodiment of the invention proposed is the binary channels antenna array system under the dual polarization condition, frequency range is the A of TD-SCDMA system, B two-band, cooperate binary channels excipient algorithm and quick allocation algorithm, be exclusively used in TD-SCDMA system binary channels technology.
In order to realize above-mentioned technical scheme, the embodiment of the invention also provides the binary channels antenna, its structural representation as shown in Figure 2,, specifically comprise:
Preferably, the binary channels of described binary channels antenna has ± 45 ° polarization orthogonal.
Preferably, described binary channels antenna between space interval more than or equal to 10cm.
It is to be noted; the particular content of above-mentioned said binary channels technology and respective algorithms can be adjusted according to concrete application scenarios; can reach under the prerequisite of identical technique effect; can realize that the technical scheme that the binary channels dual polarized antenna is disposed can belong to protection scope of the present invention; and the particular content of corresponding binary channels algorithm also can change as required; the algorithm arrangement that the corresponding binary channels dual polarized antenna of every coupling is disposed all belongs to protection scope of the present invention.
Compared with prior art, the technical scheme that the embodiment of the invention proposed promotes existing TD-SCMDA network application ability, improves the covering power of system, the accuracy and the degree of depth that reinforcement covers.
By the application of new technique, the system uplink gain promotes 3dB, and descending gain promotes 1.3-1.7dB, and the edge throughput promotes more than 70%.
Reduce the TD-SCDMA system and build difficulty.Binary channels dual polarized antenna size and approaching with the single-polarized antenna size of gain only is 1/16 of 8 passage antennas.In carrying out the outdoor compartment system construction in sub-district, the difficulty of coordinating, building reduces greatly, has promoted the public image and the social responsibility of company.
Solved the difficult problem of the covering power deficiency in TD network zone such as in colleges and universities, residential block, system's constructive ability is more flexible, and adaptability is stronger, the Construction Party who fits in the TD system more to.
Under the same covering power, half can be reduced in the antenna point position, and the antenna disguise is higher, can alleviate peripheral resident's coordination difficulty, reduces to build and coordinates to drop into, and brings distinct economic.
Existing TD binary channels technology is for initiating in the industry, the creationary binary channels technology of utilizing is carried out the construction of outdoor cell compartment system, covering power, the reduction internal interference of system have effectively been promoted, the reduction system builds difficulty, solved at the high density construction area, TD as zones such as residential quarter, colleges and universities covers a difficult problem, and the elevator system ability is reducingd the construction costs.
This system has improved the technical merit of domestic association area research greatly, helps whole nation colleague to improve the level in this field.
Below, further combined with concrete example, the technical scheme of the embodiment of the invention is described.
This project is deeply excavated TD-SCDMA protocol specification, intelligent antenna technology and many-side such as field engineering technical application combines, proposed optimization lift technique, realized the application of dual channel system and relevant excipient algorithm, dispatching algorithm and binary channels, dual polarized antenna at multichannel, smart antenna, excipient and the dispatching algorithm of TD-SCDMA system.
Binary channels TD-SCMDA network technology is based on existing network TD-SCDMA system group network technology, on the basis of existing TD-SCDMA access network, based on existing multichannel of TD and single channel technology, in conjunction with experience and the technical capability of China Mobile on existing network is built, designed applicable to the dual polarization binary channels antenna under the shelter condition and binary channels excipient algorithm and fast dispatch algorithm.
The major technique innovation aspect of technical solution of the present invention is to have designed special-purpose dual polarization binary channels TD dedicated antenna and developed binary channels excipient algorithm, fast dispatch algorithm and the RRU equipment etc. that are applicable to dual channel system.
Purpose and direction are applicability, flexibility and overburden depth and the covering accuracies for the more effective lifting of energy TD system.
Smart antenna using digital signal dynamically produces the spatial orientation wave beam in base band, the antenna pattern main lobe is aimed at the useful signal arrival direction, the low gain secondary lobe is aimed at the interference signal arrival direction, the difference on incident direction by useful signal and interference signal, select appropriate merging weights, thereby reach the purpose that makes full use of mobile subscriber's signal and suppress interference signal.
Filter when smart antenna is equivalent to sky under the parallel antenna beam control of a plurality of sensing different users, makes signal send and receive in limited direction zone, thereby improves spectrum utilization efficiency, increases power system capacity.
One, the key technology of smart antenna application
The application of smart antenna in mobile communication is divided into travelling carriage and base station, and the realization technology of smart antenna application in the base station only discussed in this part, and wherein intelligent lift-off technology, reception technique and dynamic channel allocation are the technology of 3 keys.
1, intelligent reception technique
In the applying intelligent antenna cdma system, because different user takies same channel, the multiple access that different user brings disturbs (Multiple Access Interference, MAI) and intersymbol interference (the Inter-Symbol Interference that brings of multipath channel, ISI) can make the subscriber signal that arrives the base station produce distortion, so must adopt channel estimating and balancing technique, each subscriber signal is separated and recover, be Multiuser Detection MUD (Multiple User Dimension, multi-user's aspect), whole up channel equivalence is a multiple single input multiple output system.
On the other hand, for foundation being provided for the intelligence emission, in up, also need to estimate to reflect the parameter of user's space positional information, as direction of arrival (Direction Of Arrival, DOA), spatial feature (SpatialSignature, SS) etc., their precision is estimated directly to have influence on the performance that descending selectivity sends.
At present, finishing the intelligent method that receives mainly contains based on the high resolution ratio array signal processing method with based on signal time domain structural approach two classes.Last class methods are molecule space method and based on the method two big classes of parameter Estimation criterion again.Back one class methods mainly utilize the time-domain information of signal and priori features to carry out the spatial domain processing.
2, intelligent lift-off technology
In cellular system, for satisfying the requirement of multimedia service communication quality, transmit signal power must dynamically be controlled, under the situation of the total power signal balance that guarantees each sub-district of whole cellular system (each area interference is basicly stable), satisfy the different transmission rates of miscellaneous service and different error rate requirements.
Intelligent lift-off technology utilizes user's spatial diversity, guarantees that each user receives only the base station and issues its downstream signal, is not subjected to the interference that other subscriber signals are issued in the base station in the same channel.
Realize that intelligent emission has based on feedback with based on two kinds of methods of uplink parameter estimation.Before a kind of method to be the base station return the training signal of base station by travelling carriage, estimate the response condition of down channel, its shortcoming is a waste bandwidth.
Method based on the up link parameter estimation is to utilize the consistency of some characteristic parameters with respect to uplink downlink, by the estimation of each user to upward signal, determines that the wave beam of down link forms scheme.TD-SCDMA adopts a kind of method in back.
At time division duplex (Time Division Duplexing, TDD) in the system, the uplink and downlink link uses same carrier frequency, change under the relatively slow situation at channel characteristics, can be similar to and think that the channel characteristics of uplink and downlink link is identical, can use estimation that downlink parameter is set up channel.At Frequency Division Duplexing (FDD) (Frequency Division Duplex, FDD) in the system, because uplink and downlink link carrier frequency difference, the characteristic of channel of uplink and downlink link is widely different, to estimate the uplink and downlink link characteristics respectively, so it is more more complex than using in the TDD system to use smart antenna in the FDD system, this also is the advantage place of TDD system than the FDD system.
3, dynamic channel allocation
In communication, channel allocation is to ensure communication quality, effectively utilize one of the key technology of channel.
After sky divides the channel drawing-in system, empty, frequently, the time and the dynamic assignment technology of Code Channel become new technological difficulties.The three kinds of channel allocation technique in back are deterministic, can be by system according to the user situation dynamic assignment, but the empty channel allocation difference of dividing.
At base station place, received power be more or less the same and the user side to the user of differential seat angle greater than the antenna main lobe, can share with for the moment, frequency domain channel.Like this, empty branchs channel allocation just becomes dynamic condition combinatorial problem, and along with the moving of user's space position, is to follow the tracks of the user, emptyly divides channel necessary respective change, carries out dynamic assignment at any time.Empty branchs channel allocation must with the time, channel allocation and switching frequently combine, this just needs a kind of highly effective algorithm of formation, to adapt to user's mobility.
For cdma system, because its capacity is a soft capacity, channel allocation is simple relatively.Itself has control function of power smart antenna, and its performance is better than existing power control techniques.Handover between the base station will be more flexible also simultaneously.
In next generation mobile communication system, Multiuser Detection (MUD) is a key technology.MUD utilizes multiple access interference signals architectural feature, and all excited users are united estimation, and the multiple access that can clearly estimate desired user disturbs, thereby suppresses multi-user interference, from solving near-far problem (Near Far Problem) in essence.
Yet multiple access disturbs and wireless channel has tangible spatial structure characteristic, if adopt intelligent antenna technology, will suppress to provide new dimension for disturbing.
Smart antenna can be realized directional transmissions and directional reception to the mobile subscriber after introducing base stations in mobile communication system, can eliminate a large amount of multi-user interference from the spatial domain, and can alleviate multipath effect.Therefore, utilize the space-time multiuser detection to disturb inhibition, will further improve systematic function.
Time-domain information and spatial information (si) be combined with cascade and the associating dual mode.In space-time cascade processing method, spatial filter disturbs with removing the multiple access of not removed by multi-user detector, can improve reception to a certain extent, but can not be applied to overload situations.
The space-time unite processing method is equal to spatial feature and temporal signatures to be treated, comparing with traditional time domain multi-user detector has increased the equivalent process gain, improved the orthogonality between the user characteristics, thereby improved receiver performance, and can be applied in the overload system.
Therefore, be better than the cascade processing method, but its operand that needs is big based on space-time unite processing method performance.
In the 3G (Third Generation) Moblie standard---realized smart antenna and joint-detection (Joint Detection, JD) combination of technology among the TD-SCDMA.
Because up link has the similar characteristic of channel with down link, so the TD-SCDMA system can be applied to down link to the impulse response estimated value that obtains in the up link joint detection process, realize downlink smart antenna adaptive wave beam shaping algorithm with being similar to the synthetic method of maximum power, this is the unique distinction of TD-SCDMA system intelligence antenna algorithm.
Joint detection algorithm can be divided into 3 classes: nonlinear algorithm, decision feedback algorithms, linear algorithm.
Nonlinear algorithm mainly contains maximum-likelihood sequence estimation, and (Maximum Likelihood SequenceEstimation, MLSE), this algorithm is extremely complicated, is difficult to use in requiring the mobile communication system of real-time.
Decision feedback algorithms is to obtain through certain expansion on the linear algorithm basis, and ZF DFF algorithm (ZF-BDFE) and least mean-square error DFF algorithm (MMSE-BDFE) are arranged, and their computation complexity is bigger.
In the practical application, often adopt linear algorithm.
Its principle is to detect to received signal with linear block balance device M earlier, obtains the successive value estimation that K user sends symbol, with K quantizer these successive values is estimated to quantize then, just can obtain the user is sent the centrifugal pump estimation of symbol.
Smart antenna and the Multiuser Detection handled based on space-time two-dimension combine, and are a kind of combinations of mutual supplement with each other's advantages.
When seeing the huge capacity potentiality of space-time two-dimension multi-user detector, should see that also its good performance is is cost with huge operand.Operand is greatly the major obstacle of space-time two-dimension multi-user detector practicability.The research fast algorithm will be an emphasis of space-time two-dimension multi-user detector research work from now on.
In the development of mobile communication technology, smart antenna has become a most active fields.
Intelligent antenna technology can make full use of the space separability of Radio Resource, improves wireless communication system to utilization ratio of wireless resources, and fundamentally improves power system capacity.Also have the solution that requires study of many problems though realize smart antenna, can predict smart antenna and will in the moving communicating field in future, yield unusually brilliant results.
1, dual polarization binary channels antenna
The binary channels dual polarized antenna has adopted the dual polarized antenna mentality of designing.At dual polarized antenna is a kind of new antenna technology, made up+the mutually orthogonal antenna of 45 ° and-45 ° of two consequent pole direction and be operated in simultaneously under the transmission duplex pattern, therefore its most outstanding advantage is to save the antenna amount of single directional base station, reduces multidimensional multichannel antenna.
The directed plate antenna of the directed 12dB of the use of general TD-SCDMA digital mobile communication network or 9dB is of a size of 80cm*50cm, and is oversize, identification easily, local uses such as residential quarter that can't be under shelter condition, colleges and universities zone.
The design dual polarized antenna, in dual polarized antenna, ± 45 ° polarization orthogonal can guarantee+isolation between 45 ° and-45 ° of two slave antennas satisfy intermodulation to the requirement of isolation between antennas (〉=30dB), therefore the space interval between the dual polarized antenna only needs 10cm, can reduce the size of dual polarized antenna greatly.
In addition, dual polarized antenna has the advantage of electrical tilt antenna, uses dual polarized antenna the same with electrical tilt antenna in mobile radio communication, can reduce call loss, reduces to disturb, and improves the service quality of the whole network.
If the use dual polarized antenna, because size decreases, dual polarized antenna is not high to setting up installation requirement, thereby saves capital expenditure, makes station layout more reasonable, and the selected of site, base station is more prone to.
2, binary channels excipient and fast dispatch algorithm
On existing existing multichannel antenna excipient of TD system and fast dispatch algorithm basis, the special excipient algorithm and the fast dispatch algorithm that are applicable to two passage dual polarized antennas have been developed again.
Under novel algorithm, the descending gain of system has promoted 1.3-1.7dB under certain transmitting power situation, and up gain has promoted about 3dB.
Under the same antenna point position condition, the lifting of antenna gain can enlarge one times of area coverage, and the edge throughput promotes 1.5 times, and the error rate reduces by 70%; Under same area coverage situation, the antenna point bit quantity can reduce 50%.
Adopt the binary channels technology, introduced twin-channel joint detection algorithm, higher interference free performance is arranged, greatly reduce the internal interference of system, promote the frequency resource utilance than single channel system.
By the use of dual polarization binary channels antenna and novel excipient algorithm, dispatching algorithm, the TD-SCDMA system can be under existing frequency condition near the covering power of gsm system, further reduce self disturbing of TD-SCDMA system; Simultaneously, the size of antenna is installed adaptability and the disguised level that has also reached existing gsm system.
That is to say, utilize this two kinds of new techniques, can promote the covering power and the adaptability of existing TD-SCDMA system greatly.
It is to be noted; the particular content of above-mentioned said binary channels technology and respective algorithms can be adjusted according to concrete application scenarios; can reach under the prerequisite of identical technique effect; can realize that the technical scheme that the binary channels dual polarized antenna is disposed can belong to protection scope of the present invention; and the particular content of corresponding binary channels algorithm also can change as required; the algorithm arrangement that the corresponding binary channels dual polarized antenna of every coupling is disposed all belongs to protection scope of the present invention.
Compared with prior art, the technical scheme that the embodiment of the invention proposed promotes existing TD-SCMDA network application ability, improves the covering power of system, the accuracy and the degree of depth that reinforcement covers.By the application of new technique, the system uplink gain promotes 3dB, and descending gain promotes 1.3-1.7dB, and the edge throughput promotes more than 70%.
Reduce the TD-SCDMA system and build difficulty.Binary channels dual polarized antenna size and approaching with the single-polarized antenna size of gain only is 1/16 of 8 passage antennas.In carrying out the outdoor compartment system construction in sub-district, the difficulty of coordinating, building reduces greatly, has promoted the public image and the social responsibility of company.
Solved the difficult problem of the covering power deficiency in TD network zone such as in colleges and universities, residential block, system's constructive ability is more flexible, and adaptability is stronger, the Construction Party who fits in the TD system more to.
Under the same covering power, half can be reduced in the antenna point position, and the antenna disguise is higher, can alleviate peripheral resident's coordination difficulty, reduces to build and coordinates to drop into, and brings distinct economic.
Existing TD binary channels technology is for initiating in the industry, the creationary binary channels technology of utilizing is carried out the construction of outdoor cell compartment system, covering power, the reduction internal interference of system have effectively been promoted, the reduction system builds difficulty, solved at the high density construction area, TD as zones such as residential quarter, colleges and universities covers a difficult problem, and the elevator system ability is reducingd the construction costs.
This system has improved the technical merit of domestic association area research greatly, helps whole nation colleague to improve the level in this field.
Through the above description of the embodiments, those skilled in the art can be well understood to the embodiment of the invention and can realize by hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding, the technical scheme of the embodiment of the invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) each implements the described method of scene to carry out the embodiment of the invention.
It will be appreciated by those skilled in the art that accompanying drawing is a preferred schematic diagram of implementing scene, module in the accompanying drawing or flow process might not be that the enforcement embodiment of the invention is necessary.
It will be appreciated by those skilled in the art that the module in the device of implementing in the scene can be distributed in the device of implementing scene according to implementing scene description, also can carry out respective change and be arranged in the one or more devices that are different from this enforcement scene.The module of above-mentioned enforcement scene can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number is not represented the quality of implementing scene just to description.
More than disclosed only be the several concrete enforcement scene of the embodiment of the invention, still, the embodiment of the invention is not limited thereto, any those skilled in the art can think variation all should fall into the protection range of the embodiment of the invention.
Claims (6)
1. a method that communicates based on the binary channels technology is characterized in that, specifically may further comprise the steps:
The binary channels antenna carries out gain process according to binary channels figuration and adjustment algorithm to signal;
The binary channels of described binary channels antenna by quadrature sends the described signal of communication that carries out after the gain process.
2. the method for claim 1 is characterized in that, the binary channels of described binary channels antenna has ± and 45 ° polarization orthogonal.
3. the method for claim 1 is characterized in that, the space interval between the described binary channels antenna is more than or equal to 10cm.
4. a binary channels antenna is characterized in that, specifically comprises:
Gain module is used for according to binary channels figuration and adjustment algorithm signal being carried out gain process;
Communication module is connected with described gain module, is used for binary channels by quadrature and sends signal of communication after described gain module carries out gain process.
5. binary channels antenna as claimed in claim 4 is characterized in that, the binary channels of described binary channels antenna has ± and 45 ° polarization orthogonal.
6. binary channels antenna as claimed in claim 4 is characterized in that the space interval between the described binary channels antenna is more than or equal to 10cm.
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